<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item>
        首页
      </el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片试图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        :closable="false"
      />
      <!-- 进度条 -->
      <el-steps
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息" />
        <el-step title="商品参数" />
        <el-step title="商品属性" />
        <el-step title="商品图片" />
        <el-step title="商品内容" />
        <el-step title="完成" />
      </el-steps>
      <!-- tabs栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          tab-position="left"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name" />
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
            >
              <el-input
                v-model="addForm.goods_price"
                type="number"
              />
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
            >
              <el-input
                v-model="addForm.goods_weight"
                type="number"
              />
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
            >
              <el-input
                v-model="addForm.goods_number"
                type="number"
              />
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop="goods_cat"
            >
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              />
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.id"
            >
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                />
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals" />
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <!-- action表示图片上传地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button
                size="small"
                type="primary"
              >
                点击上传
              </el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >
            <!-- 文本编辑器 -->
            <quill-editor
              v-model="addForm.goods_introduce"
            />
            <!-- 添加商品按钮 -->
            <el-button
              type="primary"
              class="btnAdd"
              @click="add"
            >
              添加商品
            </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 预览图片对话框 -->
    <el-dialog
      title="预览图片"
      :visible.sync="previewDialogVisible"
      width="50%"
    >
      <!-- 内容 -->
      <span>
        <img
          :src="previewPath"
          alt=""
          class="previewImg"
        >
      </span>
      <span
        slot="footer"
        class="dialog-footer"
      >
        <el-button @click="previewDialogVisible = false">取 消</el-button>
        <el-button
          type="primary"
          @click="previewDialogVisible = false"
        >确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data () {
    return {
      // 预览图片地址
      previewPath: '',
      // 预览对话框显示与隐藏
      previewDialogVisible: false,
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 上传图片地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      activeIndex: '0',
      // 添加商品的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属分类
        goods_cat: [],
        // 图片数组
        pics: [],
        // 商品内容
        goods_introduce: '',
        attrs: []
      },
      // 验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请输入商品种类', trigger: 'blur' }]
      },
      // 分类列表
      catelist: [],
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: []
    }
  },
  methods: {
    // 上传表单
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要表单')
        }
        // 执行添加逻辑
        // 深拷贝对象 lodash cloneDeep
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)
        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }

        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    },
    // 监听图片上传成功事件 res是服务器返回数据
    handleSuccess (res) {
      // 拼接得到图片信息对象
      // push到数组
      const picInfo = {
        pics: res.data.tmp_path
      }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics)
    },
    // 删除要上传图片操作
    handleRemove (file) {
      // 获取临时路径
      const filepath = file.response.data.tmp_path
      // 从pics数组 找出对应索引
      const i = this.addForm.pics.findIndex(item => {
        return item.pic === filepath
      })
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm.pics)
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
    },
    // 点击tab触发事件
    async tabClicked () {
      // 证明访问动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态啊参数失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }
      // 访问静态属性页面
      if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败')
        }
        this.onlyTableData = res.data
      }
    },
    beforeTabLeave (activeName, oldName) {
      if (oldName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // 级联选择器变化
    handleChange () {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = []
      }
    },
    // 获取商品分类数据
    async  getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类失败')
      }
      this.catelist = res.data
      console.log(this.catelist)
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  created () {
    this.getCateList()
  }
}
</script>

<style scoped lang="less">
.el-steps {
    margin: 10px 20px
}
.el-step__title {
    font-size: 13px
}
.el-checkbox {
  margin-right: 5px !important
}
.previewImg {
  width: 100%
}
.btnAdd {
  margin-top: 15px
}
</style>
